Gyrosub

The Gyrosub is a multi-functional transport designed and owned by the Spy Smasher, a World War II-era agent of the Office of Strategic Services. It can function as an airplane, automobile, boat, and submarine. On one known mission, the Gyrosub's aquatic features were used to get close to a castle occupied by Dr. Krieger. After escaping with the Captain Nazi Serum, Spy Smasher took off in the sub. It is assumed the Gyrosub was decommissioned after Spy Smasher retired from active duty.